DYTICIDiE. HYDROPORUS. 59 



Var. /3. The elytra dusky, with obsolete ferruginous lines, with the outer mar- 

 gin of the latter colour : it also varies in the intensity of the lines on the elytra, 

 which are sometimes deeper and sometimes nearly obliterated. 



Not uncommon in ponds and ditches in the vicinity of London ; 

 in Battersea-fields, the New River, and also in Norfolk. « In a 

 ditch at Crosby, near Carlisle." — Dr. Leach. " Turf pits in Bot- 

 tisham and SwafFham-fens." — Rev. L. Jenyns. " Kensington- 

 gardens. " — Rev. F. W. Hope. 



Sp. 25. nigrita. Oblongo-ovatus, subdepressus, niger, pubescens, antennarum basi 



pedibusque rufis, elytris stria disci punctata. (Long. corp. if lin.) 

 Dy. nigrita. Fabricius. — Hyd. nigrita. Steph. Catal. p. 47. No. 463. 



Oblong-ovate, slightly depressed, black, pubescent, very finely punctulate : head 

 broad, the margin of the vertex ferruginous : thorax slightly convex, totally 

 black : elytra broad, ovate, depressed, black, more or less pubescent, with a 

 very obsolete punctate stria on the disc, and sometimes another towards the 

 margin : body beneath pitchy-black, shining, rather deeply punctate : legs 

 ferruginous-red, with the hinder thighs pitchy at the base. 



Found occasionally in stagnant waters near London. " Netley, 

 Salop."— Rev. F. W. Hope. 



Sp. 26. trivialis. Ovatus, subconvexus, niger, subpubescens, thorace disco sublcevi, 

 margine postico elytrisque punctatis, pedibus piceis. (Long. corp. 1^ lin.) 



Hyd. trivialis. Spence MSS.?— Steph. Catal. p. 47. No. 464. 



Ovate, rather convex, black, slightly pubescent : head pitchy : thorax with the 

 disc transversely convex, nearly smooth, the posterior margin rather thickly 

 and strongly punctate : elytra somewhat convex, a little attenuated towards 

 the apex, thickly and rather strongly punctate throughout : body deep black 

 beneath, punctulated : legs pitchy : antennae rufo-piceous at the base, dusky 

 towards the apex. 



Not common : found near London, and in Yorkshire. " South-? 

 end."— Rev. F. W. Hope. 



Sp. 27. minutus. Oblongo-ovatus, subdepressus, niger, pubescens, lateribus thoracis 

 pedibusque piceo-ferrugineis, antennarum basi ferrugined. (Long. corp. l^lin.) 

 Hyd. minutus mihi. — Steph. Catal. p. 47. No. 465. 



Oblong-ovate, subdepressed, black, pubescent : head with the frontal foveae very 

 deep : thorax with a transverse impression behind, the disc rather convex, 

 smooth, the hinder margin punctate, the lateral margins deep pitchy-ferru- 

 ginous : elytra pubescent, obsoletely punctulate, with a faint elevated carina 

 on each towards the suture : body deep black beneath, the base of the abdomen 

 and the plurae rather deeply punctate : legs pitchy-ferruginous : antennae with 

 the base ferruginous, the apex rather dusky. 



